/* don't allow repeated values in post list as they'd result in
     zero-length segments */
  {
    int *sortpointer[VIF_POSIT+2];
    for(j=0;j<count+2;j++)sortpointer[j]=info->postlist+j;
    qsort(sortpointer,count+2,sizeof(*sortpointer),icomp);

    for(j=1;j<count+2;j++)
      if(*sortpointer[j-1]==*sortpointer[j])goto err_out;
  }

  return(info);

 err_out:
  floor1_free_info(info);
  return(NULL);
}